Things are bad when sRGB is considered wide gamut, but some screens are pretty poor.

Aside from gamut you need to pay attention to viewing angle - including the vertical. Ideally a blank screen would look uniform everywhere even though you you may be looking left at some parts, right at others, straight on to the centre, and up or down. The bigger and/or closer the screen the greater the variation in viewing angle.

Too much variation in tone or colour at different viewing angles will undermine the benefit of having a good colour gamut.

Another key aspect of using Ps and the like on the road is knowing for how long you will be on the road. If you're away from home for a few days at a time then perhaps any laptop will suffice. If you are away for months at a time then you need a mobile base station and must weigh up the need for extra drives, bigger screen, etc., against the loss of portability. That's why I use a 17" laptop when a 15" would generally be considered more convenient.

Another vote for Lenovo Thinkpads or HP workstation notebooks, the HP Elitebook 8770W or the smaller 8570W, I use both....they're indispensable when it comes to speed for photo editing.

The previous generations Elitebook Workstations which I also use, can be bought for dimes on the dollar, and with easily accessible upgrades bays,320GB HD and upgradeable to three 500GB+/- hd's or ssd's, up to 3.4GHz quad-core processors which can be upgraded to the latest processors , and 8gb of ram upgradable up to 32GB.

The HP Elitebook workstations up to three generations back, will beat the pants off of many modern consumer laptops for photo editing and are easily upgradeable ....or any of the Lenovo Thinkpad workstations are still some of the fastest notebooks for photo editing.... and my favorite Lenovo from a few years ago being the Lenovo W700ds.

Want a notebook for severe field conditions and built to military standard MIL-STD 810F specs ...any of the Elitebook Workstations are built to take a beating(the last few gen of Thinkpads are equally as tough).The Elitebooks are capable of running up to four display monitors.

Lenevo stopped producing their large workstation notebooks, because they couldn't compete with the larger HP Workstations price wise. But buying a previous generation Lenovo workstation is still a good move, and like the Elitebooks are upgradeable.

Once you use the 8760W you will never want another brand. I have mine configured with the "dream screen", three SSDs and 16GB of memory which for still photography is enough. The D800E files fly. I will probably update it to an Ivy bridge in another couple of years. Other than that its locked in unless I decide to do movies, then more memory would probably be usefull.
Regards
Paul

I love my W520. Definitely get the 1080P screen if you go this way, it is wide gamut (as a laptop screen goes). I read somewhere that it is 94% of RGB colorspace. I don't have the means to measure it myself, but I know that it is the highest quaility screen that I use on a regular basis. The difference is especially noticable in the reds. I wouldn't bother with the built in color calibrator, higher quality external ones cost a lot less than the upgrade price. This laptop can also easily be upgraded further than most:

Start with a W530, add an MSATA SSD to run all software from, and add two more 8 GB RAM chips for a total of 24 GB RAM, replace the two installed sticks as well to run 32 GB.

For less than $2k, you have a laptop with an ivy bridge i7 quad core processor, wide-gamut screen, 256 GB SSD, 500 GB storage hard drive, and 24 GB RAM.